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Bug: Widgets can render twice during a scheduled render #712

merged 2 commits into from Apr 2, 2020


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@agubler agubler commented Apr 1, 2020

Type: bug

The following has been addressed in the PR:


Widgets can end up rendering twice during a single scheduled render which can cause issues with the rendered dom and cause unnecessary processing. This happens when the widget and a parent of a widget is invalidated and ends up rendering due to a property changes or being marked as dirty - then during the render something marks the widget dirty again which means it's rendered again.

The widget should be marked as not dirty after the render and not before.


@agubler agubler added needs back-port The fix requires back porting to one or more previous major versions area: core Core bug Something isn't working labels Apr 1, 2020
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@agubler agubler force-pushed the do-not-mark-dirty-during-render branch from 50f7039 to 4b51411 Compare Apr 1, 2020
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codecov bot commented Apr 1, 2020

Codecov Report

Merging #712 into master will not change coverage by %.
The diff coverage is 100.00%.

Impacted file tree graph

@@           Coverage Diff           @@
##           master     #712   +/-   ##
  Coverage   97.75%   97.75%           
  Files         120      120           
  Lines        6949     6949           
  Branches     1577     1577           
  Hits         6793     6793           
  Misses        156      156           
Impacted Files Coverage Δ
src/core/vdom.ts 97.98% <100.00%> (ø)

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@agubler agubler merged commit 32bab69 into dojo:master Apr 2, 2020
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@jellison jellison mentioned this pull request Apr 2, 2020
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agubler added a commit to agubler/framework that referenced this pull request Apr 3, 2020
* failing unit test for rendering twice during a scheduled render

* mark dirty false after render
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area: core Core bug Something isn't working needs back-port The fix requires back porting to one or more previous major versions
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3 participants